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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02909bdd99f934ea0606c6b2247502068976518a310246a25d3cc3700d7f2427' 
  AND token = 'Wq4olD2F6fdOgOi8oqHDzkXq0WNWHnwXVHNOXo+w3jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}